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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8626ba4e945318b9cdd445d6f38afea14a6a33eecfb9e4ef7a4fcb6794818385' 
  AND token = 'uYXLNDl+jtPDmkar78SOUoVPe/hX4fUcamx19pYNdKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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