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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7461db841e0775a84b58c2ac24c0074c6d8afa9a6f7fa1e8ca9a7b2f7a1b7912' 
  AND token = 'gIUDKkj/nofiLX/YaBPr9fdn2OPQB36wwc4XVAEqLP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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