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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67ec8099cef45a302bcdf8bca618dd0a03572e59aa066a1514b22ad6444297d' 
  AND token = 'ej6EI/Sz4dfYMntCksMQ6VwOFk1EygVJh9xsI2QP1PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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