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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fa45625189eefb0dc1924e550804ae53446b9142e7540389b6d8df26baffd7' 
  AND token = 'ycBAUG3XRo4/+kVzcpy/E4JHOh5i3PDGuE9dK6sfeVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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