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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1d72a96e6a7d3291f1bbeed1c3bb8c869f76437b5a8a803e8e9963cb3c053e' 
  AND token = 'HXaeCZl5wAPj9L3MEVTBQk8mWCXaqAaI4z88SPdkXpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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