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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58ae6260d08cd94369f02e44ab2f828c31e631cbc43aec82fefb413700fadb1' 
  AND token = 'kciGfyWHR/HN4ibbKDSc9XHoIiPy/VU1Sf6u0IcbYN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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