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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3750bc26c40630336dbd005c22f6fd906fff482490db7ec353fdfd5a16b34c8a' 
  AND token = 'jVtpzPfNV7glrZ/Pths2Y5MU6FdxhTnZajSwQtoHMig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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