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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c674b183e204c8a9e247cc428e7a0a6e68088a7a6c7bc7cb3253fccffaf3d5b' 
  AND token = 'C/IA1P7An0TAVX4+LSd3NAUQSSRGSuejyctOrMZNh+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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