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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9d1a3e4e418dd1529eb7bf22c08e0b11e37efcc122f60fc504f041c425d894' 
  AND token = 'sNOdVwGnLnEf56sd7FpsW/cAosXqVBrWemNyLqK/z6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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