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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023d6584052f9427fe0c121b3291dac03cedde8e89f023982078bd7a283d632d' 
  AND token = '5W5SDxDB6Nz+is8Z3IetnTcyxf48s8iZZwqI7by8lP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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