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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20478ae1eb3247800d6ddcc718eb145decf52df8657fa0be9a23b2f4de979693' 
  AND token = '0h6nOubTXs9Ooda0cCr8NqY9aonh+X7+cdect9hVvEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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