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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92669ff66d77307b05e364ad6bed125dd2644f757a4a1775c55c93cd0fdae2f0' 
  AND token = 'ikNGfQrBFam2IzLJEAMq/QEZN3VOGblNfS8S7pG/aMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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