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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91173cc9fd3b270cf7a9a66c756e8ca204b439a118caae8b17e21b92a7058726' 
  AND token = '7TP0m+ccW428UHaaY8zMMZ0aYr3BA5gTGlHlIJHpeyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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