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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60020ed0d18f3111bba3e0eb3bc49a46803f5a483f6c7d53d6a654aa286aa8dd' 
  AND token = 'ZdQuCCc3mrKxYuHFIPOC5I7kK90Cl0PkUQm11V46I9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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