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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b5c0852edf27f6821a754c912af9b9022f7552a6082f703985338c1877762c' 
  AND token = 'N5VRZr+WPQaY+KDz7AUX/x+nk9EKOHU5KN3Ox5+iKGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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