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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900f62ba93053c7e1e3b2a01546c0e0bcc8ffe255c082f3bb2c1eda5bb4e0bb3' 
  AND token = 'R1e7UAzPPS7CCXJ4BCfGu+riAeiQAzPNd+TDtFX8aI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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