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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63575f41ee82ab6519aaf6bc6652cb011843a503e153626453356aafc972cb85' 
  AND token = 'VwCsUTk4lDmj7xD7orF2Wq4dAsTTf6uaSaiGdjUXEp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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