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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2f4905a24e2ad7c4d8fbd33c09273ecdabbbeed6e45bc48c2605cd790106fe' 
  AND token = 'IruH8qzI/BkOi/uEsTD6D1tZSmca9jsmyFYqCSeRBKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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