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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5572a9857d5706ca6fb8cbe696bd1d9a7686e8369122a5f264f03e2c9b794260' 
  AND token = '/xKBDT+h46QhjKGot3N4/FPDrFrPPwFx/N20PQuicfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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