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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1267453fb66923ef6c19f15f5983802be9b3a494b375f982b60ad4e59d00495' 
  AND token = 'Nz+4zGi/O4LluP/MQf97G1Es2U4yTb793cy8ybxGWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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