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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130357b4d96e8e3e98cd0fd1b756851ba2b568b8b4eafa866639233c020c378a' 
  AND token = 'ele/vvsdhVzFgY0EGs/RDmxG75cSbdWX5EkVmQaJskI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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