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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df1db80bc20ed482062c2c2bc86d1d80c8ec825ece4c03cdbe4c198b2be5b4e' 
  AND token = '284a+jrUx87IkoSb6/84XyzbucgYOj0pKbnLwi5SB4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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