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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c616805a922f24d6ed3c2788811c89d9c81ce1db5236c3aca599e13f5657d93d' 
  AND token = 'Ku9HvoG21/FucmbGkIru/fBuu2E0krk19sPJ10jybXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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