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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08c179fc36878cba64126ac3fe715e8baf0d7e6fbd6b7f410bf91f17c92423a' 
  AND token = 'prfMB+w8Gas/3eQeQIwbzrASIZI6Yc/FQ0FITR75R0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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