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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706e886d3e3dfee37aa7eca221fcb8bf4d3bc92af4c7dc0797ba9889ebc47444' 
  AND token = '299+FQkGNO9RVinfWgK8rFp1PN9+L51/zniiAyFS3BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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