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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea7b16daaf4fa81ce0a64854796a1a905935a0117b01c6fe41dc89fecc7b26f' 
  AND token = '8cem11/IGS70Q7bMuprsWwsn55QcpsB69zaiElvB/wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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