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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077c806d73d4d228f7656456a7899bbbdee0b546d97a534a1922254d9ac546bb' 
  AND token = 'd5q7XiCDDFxv/GcJprA20SkBFR/nuYx/KMUNlikazxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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