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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b69c8b5217337a9709177928fa36d61105e2b51f2c7fb53cec0fc689fa685b' 
  AND token = 'yV92M5k3db5JUl5llSjy1FXWXcy7sQ46U+UzTltneZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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