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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0bb4463fa1c584c29bac134c34b7f1a1a849ba5eba326e6961d3acb1860fee' 
  AND token = 'XiZJJjNYcpmL929G9al1TR0UO0hEu0NQcB1jb+5sN+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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