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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f262c2b6b3fc8bc595ca916bc1e626539214e3b0d88afdff6de899faea1b16' 
  AND token = 't02MxoU16rY0B446IfUNCO9Dv/LZKdq8w3lGqcQ7c3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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