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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8cebc27e5bdabc34ee9138c2c449d669becb025cb3b3cea3438d3ddae402f8' 
  AND token = 'UK6LAo92nHZ36JT+KN3lz8keqQf1nBWFBGQi3wOsJRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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