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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90db926dc46c18cef4b74334e16121c96bd805984579819c93c0a5bb33db04b' 
  AND token = 'rgXF1ruNs+kqeYACphf8o7LvInrrrmA0yIUA4I/I9O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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