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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755132fe6cce33c4c89ff4f26279a1bd3582fb588bc65f6d7a099217f7eddcb2' 
  AND token = 'FuoP3WvTW3bBUgmhseUylPI5LA7o81b9FtuDJgruADs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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