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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66aa5748eaaf22c08fca15c650566191f7a31d320b13d4e478f1fa1d688ad37a' 
  AND token = '1L13iBYJpR3/wdW6AVlWXphZ/znLYyLz4uug935fyyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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