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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1e337e7cc130295f71e8e6bdb9098de7c96c0610da099cdce6081ffa26a2ee' 
  AND token = 'jm0EQphxHiGhywbHhnSgJosbca42B2zhHes+gPJ/i8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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