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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb2c4dfe141abf7cd25e557185ac6dbc85e7d8f89a53bbb74ac989f3b323096' 
  AND token = 'kkw7sU9EbaufJA2Pcd81FZTyelp6Bf/QvosgzJ3OZvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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