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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd7212570d5d8592f4b4f734fd327b24806f43e1627425433b9fbea36b97cbb' 
  AND token = 'Xy8yLqOK5LNhER7OrP2s00sit79cKombSDQcH/eegjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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