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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ce2d64e1e3cbd136ab0dbfc14dde1f9f95293b77af9ae0d21665ce4f75fa17' 
  AND token = '8+uXl6Uf4lykrvgcekrMl/7ib4Ff7AldvIn1tNaJ/Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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