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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40142e36412fc9de55a380ddf1bfad70da0d1214d7a7ad816ed8706840d2169d' 
  AND token = 'Vb0GzXhwd6SVcQSGTMOKXPdSXcUjNE9qPNt74iTJ+AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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