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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabc30e43ab5c28c492caec147f30f3f6eb22c1c40d26fc1ab5c9396b1ff5657' 
  AND token = '+vPIXXRFcgLHkSChObtShGjZWs6cT6HdJDiJr9beQzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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