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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bae0198cef8083d324649391d690cb01dd0a65829f023c38862ab190f61838' 
  AND token = 'j1g7Pdxhk3OVd8jFd0e3izshHSA4jYYnA10Q/w8ycI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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