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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c0f4256025f87e1a4990716db6a3d811c206c70e273d4aa501fcf20a32c8c7' 
  AND token = 'rI4qH1/L8+bmuLuO5GPW5ubUSsVrGQ6aKQgKEiNra+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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