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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220383784938b4bbdab4d65943a65d149b26d6ee0068843c4836ad8afd177bcb' 
  AND token = 'wXD3vNp/uEAx8FSWTE7EAYwTWCQznjW6TaS8fJ6IwPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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