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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ec37cec8742062a37607884e686f011ab8dce94507b99d5a62e19af3a752a8' 
  AND token = 'ASGk8y2KnmIOUgLfVwNWorhevL9Hxw6OBablu4CQwn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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