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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb976dbea26684a9d9be73831c23a8362e687b3aa178461291d1e13929e6b82d' 
  AND token = 'xmOOPqZ1A2Sn2f9bPFkXMud1msH3nux8dq53gdLmu0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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