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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7685fc438fa44e0179b6a359745983397b16f295f0d41a68994853ca95381e' 
  AND token = '4stf9R3dmHi4/1VlfE4w0CilUDDbwcQoaW+ln2u8tXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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