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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b79612e8fd0aeefb799227768a6f06d76caa801a862d1768bf7aba06ccd639' 
  AND token = 'AtNGuWP77VivHN9zfejCYdwcgfyy/cHhBQm7pzLOIhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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