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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8413a977373f2a1618cb99f0b4a82a370476ebd73862958413c03874481f9020' 
  AND token = 'zoCrpX42Lw812XT50+Va8ickhh72c4E+TDK0z4bi8Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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