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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e1b92c0204790e879a3f2e98f0fe219ee39467cf52e85dbfffb84e3c809768' 
  AND token = 'Njp9VP+uV2A8eO0qNtHlONvQPSeG5hICYILUUmk9ZcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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