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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72215c6c0bc7f8b1cb5a0be36dfeba777cac1f2e5e44e692b6a8d804ea824094' 
  AND token = 'AzUpU1hSXEez17Tqffj76yXWJt6tPtLXurpPWyo5tp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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