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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697d32abde20e22a945851a3aa306fa2ed6d2e208d002ee3e97e991877b09313' 
  AND token = '4i2dArdcpiZtHXR3B3h+WYflxX+ECsJMoMwWbpDUzVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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