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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638b09428f69b5d6a44ed3632a3a0caeaa51af4b2cfda0b8ebc3808dc902bb42' 
  AND token = 'EZ271rQ/fG4DJGfqOh2wtJvc203ZTo7rydRisKyENzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}