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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5230f6afc419d6a8c6d94ef535fc58385305159212c3792e2f647d468001306b' 
  AND token = 'uK8KJXMUzOtmz8pCYzjtPtH+8LSIdbkvyoaksXp51dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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