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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c68a4d5e6e7ee6ac954e4f69447c89119fce600f94a58143e904edcac04dd' 
  AND token = '8XwtgFvgQTrodBqF2haF/mGuFkz2XbXX/wy1sXHAwU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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