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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600025f4ceea08877b1928344083fe2f9d6a6f70ff615adbb4bf194066926514' 
  AND token = 'C1Prou4wmpWlXZndOHaLWb6cuiJt3Fy7DN0agzP+xYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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