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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955dc5d284244d13657c70ee4e518c7980f1388c221015ed7cdb9701048cdc93' 
  AND token = 'nW0ANjrSWrKenJ8ZEccSJ5nN0rmDSN8h73Z3ibzNjCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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