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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbd6ea63a63eb70f89b4949874556eff74b544eb74400bd7edf6cec8da8c0bb' 
  AND token = '+1UYUNpdaWOxiorlX8LIlKSuw0bGIpCNUSl0C5CRSjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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