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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b7e855a09f2ad54dd0aaf004c410ba73a25aaa2eb975ae1c50ebb8e5c563d1' 
  AND token = 'oaxNy8IYhwyrlDVbOqlMNsZqwEAAH7Qb5qytpHHpaLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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