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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a6641ebce1923db4a2d6814ee464169b380e07c8a9bb3f8f6bdee76930c1e9' 
  AND token = 'z5vtF8C/FM/SvA2/hcacyrdilB3jOxLOBOuOMlkZW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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