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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056cbc4ea73505f0c71997300d1694ef765e57474e2c34377e41b695a2db90fb' 
  AND token = 'aiVZ8DQbAYhMAwsRlv5xeQku6u+czPpFsGDNz4F7p+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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